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Sagot :

Bonjour,

a = 1/5

c= 2/9

d= 1/7

Exercice 5

a)

-4-5 = -9

5-6 = -1

=> -9/-1 = 9

b)

-21 *+21= -441

-13 - 68 =- 81

=> -441 / -81 = 441/81 = 49/9

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